The SPC Training Game that shows why “Fixing” Noise is a mistake

If you’re tweaking your process every time you see a bad result, you’re not improving it—you’re destabilising it. And the best way to teach this? Run this simple die game in your next training or workshop. The die game exposes the dangerous myth that every defect demands a reaction. Roll a die 30 times, and you’ll get a roughly even spread of 1–6—common cause variation. Now add a rule: If the result is above your target, subtract the difference from the next roll; if it’s below, add it. Within rounds, you’ll be rolling “minus twos” and “tens,” spiralling into chaos. That’s what happens when operators “correct” noise: They turn stable processes into unpredictable messes. The game’s power lies in its simplicity—anyone can see how tampering with a system in response to normal variation makes things worse, not better. Use it to spark discussions about when to act (special causes) and when to leave the process alone (common causes). But the real magic happens when you tie the game to real-world scenarios. Ask participants: What if this die was your production line? Suddenly, the urge to “fix” every outlier feels familiar—and dangerous. The game also reveals why operators resist inaction: It feels wrong to do nothing when defects appear. That’s your cue to introduce process capability (Cp/Cpk) and improvement projects as the only way to shrink variation. End with a challenge: What would it take for your process to only roll 3s, 4s, and 5s? Now you’re talking about root-cause analysis, not quick fixes. #StatisticalProcessControl #TrainingGames #OperationalExcellence    • The SPC Training Game that shows why “Fixi...   0:00 The die game: Why your “fixes” are breaking your process 1:09 How to run the game in a workshop 3:50 Watching common cause variation spiral into chaos 6:37 The psychology of over-correction (and how to address it) 9:13 Tying the game to real-world processes 12:08 When to act vs. when to walk away 14:20 Using the game to teach Cp/Cpk and process capability 17:15 How to end the game with a call to action Interested in working with me to boost Operational Excellence in your organisation, or perhaps more personal coaching on your CI career? Check out my website for details or go to my contacts page directly (www.tommentink.com/contact). The Die Game: A Powerful Way to Teach Process Tampering Why Your Process Adjustments Are Making Things Worse (And How to Prove It) From Chaos to Control: Using a Simple Game to Explain SPC The Training Tool That Shows Why “Fixing” Noise Is a Mistake How to Make Statistical Process Control Stick in Your Workshops